Fix PUM/UIM filter error when not applying TDCFs

This fixes the failure that occurs when running gstlal_compute_strain in full calibration mode ("unified," "DCS," "C01") without applying the TDCFs. The fact that the new unified filters files produced by pydarm do not contain a combined PUM/UIM filter was causing this failure. Now the filter is computed as the sum of the PUM and UIM filters.

bin/gstlal_compute_strain

@@ -653,10 +653,10 @@ if CalibrationConfigs["calibrationmode"] == "Full":
 		if apply_kappapum or apply_kappauim or apply_complex_kappapum or apply_complex_kappauim:
 			raise ValueError("PUM and UIM actuation filters are needed since the PUM and UIM stages are being split")
 	try:
-		pumuimchainsr = int(filters["actuation_pumuim_sr"])
-		pumuimdelay = int(filters["actuation_pumuim_delay"])
-		pumuimfilt = filters["actuation_pumuim"]
-		pumuimfilt_model = filters["pumuimfilt_model"] if "pumuimfilt_model" in filters else None
+		pumuimchainsr = int(filters["actuation_pum_sr"])
+		pumuimdelay = int(filters["actuation_pum_delay"])
+		pumuimfilt = filters["actuation_pum"] + filters["actuation_uim"]
+		pumuimfilt_model = filters["pumfilt_model"] + filters["uimfilt_model"] if ("pumfilt_model" in filters and "uimfilt_model" in filters) else None
 	except:
 		if not (apply_kappapum or apply_kappauim or apply_complex_kappapum or apply_complex_kappauim):
 			raise ValueError("PUM/UIM actuation filter is needed since the PUM and UIM stages are not being split")